文件及其操作在程序设计中是非常重要的内容，合理地对其进行利用，可以大大扩展程序的应用范畴和功能。在计算机系统中，文件是一种宝贵的资源和手段，例如我们编写的源程序就需要以文件的形式保存起来，以便能在不同的时间和地点重复地利用。在程序中使用文件操作，可以对文件进行加工处理，或者创建新的文件，使程序的数据得以永久的保存及再利用-File and its operation is a very important element in the program design, its rational use, can greatly extend the application scope and functions of the program. In computer systems, files are a valuable resource and means, for example, we need to save the source code written in the form of files together so that you can repeatedly use at different times and locations. Used in the program file operations, you can file processing, or create a new file, so that the data can be permanently stored procedures and reuse